Ventilating apparatus



April 28, 1931.

J. J. MULLIN ET AL VENTILATI NG APPARATUS Filed Aug. 8, 1928 [Ill/III gin newton).

69 lid/[12 4 jamesfl j y Patented Apr. 28, 1931 warren STATES PATENT to-FHCE JOHN J'. MULLIN AN D JAIEES L. FOLEY, OF DETROIT, MICHIGAN VENTILATING APPARATUS Application filed. August 8, 1928. Serial No. 298,18 4.

This invention relates to ventilating apparatus and particularly to thatrtype designed for use in connection with the kitchens "of homes and like places, the principal 5 object beingthe provision of a simple, eifi cient and economi'cal apparatus by which the heat and odorsofcooking'may be re moved from a room.

Another object is to provide a ventilating l apparatus designed for insertion in the stack of a heating,'cooki'ng or other like apparatus.

Another object is to provide a ventilating apparatusadapted for insertion in the stack 1 of a heating, cooking or other like apparatuscomprising a casing having means for connection to the stack at one point thereon, and means for connection to the-stack at anotherpoint thereon, the second means having a duct leading to and discharging within the first means, thecasing being provided with an opening and means for drawing air into the opening from the room and forcing it through the first means into the stack,

ing through the first means will cause a suction in the duct at the point of discharge of the duct therein.

A further object is to provide a "ventilatprising a casing provided with a collar adapted to be received in a' flue and a second collar adapted to be connected to a stove or other apparatus, the second collar being provided within the casing with an extension forming a duct discharging within the first collar. This duct extends, without interruption, completely through said casing, the casing being provided with an opening and a motor provided with a fan disposed in'the opening. The fan draws air into the casing and forces it into the flue,

at the same time causing air to be drawn from the stove'through the stack and discharged into the flue, by a suction. effect,

at the outlet of'the mentioned duct, beyond the "wall of said casing.

The above being 'among the objects of the present invention, the same consists in certa'm featnres'of ccnstrucuen and ce'mbma the construction being such that the air pass ing apparatus of the type described comtions of parts to be hereinafter described with reference to the accompanying drawing, and'then claimed, having the above and: other objects in View.

In the accompanying drawing which illustratessuitable embodiments of the pr'esent invention, and in which like numerals refer to like parts throughout the several differentviews, I

Fig. 1 is amore or less diagrammatic side View showing a stove and a flue with aventilating apparatus inserted in connection between thesame. v

Fig. 2 is an enlarged side view of the ventilating apparatus shown in-Fig. 1 with parts thereof broken away to show the interior of the same in section.

Fig. 3 is a face view of a ventilator shown in Fig.2. I

Fig. i -is a view similar toFig. 2 showing a slightly modified construction.

Fig. 5 is a fragmentary sectional-view illustrating a modified form ofdi'scharge collar for the ventilator shown in the previous views.

The ventilation of kitchens and i like places has been the subject of considerable investigation in recent years.- In hotels and=in the higher class ofhom'es hoods over the stove connected with al'lue are usually provided during the construction of the building. However, when such'hoods are not provided during the construction of the building, it 'is usually a difi'icultand expensive proposition to -provide the same at later date. The usual method of ventilating a kitchen which has not been provided with a hood over the stove is tomount a fan in the-transom over a door where such a door is provided leading to the outside 'of the building, or at the upper portion of a window open1ng,where no door to the outside is present. Either of these two last mentioned constructions have their advantages but at'the same time they are usually located at a point relatively remote from the stove so that the grease from the stove and other vapors suspended in the'air have ample time to come in contact with and be depesitedsen the walls andobjects in the effect of the fan is considerably impaired.

In accordance with the present invention we provide a ventilating construction for use in those kitchens which have not originally been provided with ventilating hoods, and which construction retains all the advantages of a ventilating fan mounted in a transom or window opening without being burdened with the disadvantages thereof, and which furthermore is not 21f" fected by the direction of the wind on the exterior of the building.

The manner in which this is accomplished will be apparent from a description ofthe drawing in which 10 represents a wall of a kitchen or other room on to which a flue 11 leading to a chimney opens. 12 is a stove, illustrated as a gas stove for the purpose of explanation but which obviously may be a stove of any description. Ordinarily the stove 12 is directly connected to the flue 11 by a pipe as in conventional constructions,'but in the case of the present invention a ventilating device indicated generally as 13 in Fig. 1 is directly connected to the fiue l1 and in turn is connected by a pipe 1a with the stove 12.

Referring to Figs. 2 and 3, it will be seen that the construction of the ventilator is as follows: A casing 13 which may be of any suitable contour, but which is shown substantially square, is provided with an integral rear wall 15 and an open front which is closed by a face member 16. The rear wall 15 is provided with'a collar 17 which is adapted to be received in the flue 11 in the same manner that the conventional stove pipe is received therein. The casing 13 may be further secured to the wall 10 by means of screws 18, inserted through flanges 19 projecting outwardly from the rear edge of the casing, and threaded into the wall 10. The bottom wall of the casing, as viewed in Figs. 2 and 3, is provided with a downwardly extending collar 20 adapted to be received in the pipe 1 1. Interiorly of the casing the collar 20 is continued as a duct 21, decreasing in diameter from the collar 20, and extending to a point within the collar 17 at which point it is adapted to discharge into the collar 17, the duct 21 within the collar 17 being of sufiiciently small size as to permit ready flow of air between the collar 17 and the duct 21. The forward wall 16 is provided with an opening bounded by an annular flange or collar 22 on the inside and a funnel-like wall portion 23 on the exterior. Suitably supported within the casing as by the bracket 2% and screws 25 is an electric motor 26, the axis of which is disposed in alignment with the center of the opening in the forward face 16 and shaft of which is provided with a fan 27 disposed within the collar 22. The outer edges of the fan preferably extend into relatively close contact with the inner walls of the collar 23. The electric motor 26 may be provided with wires such as 28 whichextend downwardly to a point immediately above the stove 12 where they may be provided with a control switch such as 29, shown in Fig. 1, for the purpose of controlling the operation of the motor 26.

The operation of the above device will be readily apparent. When the electric motor 26 is running, air is drawn into the casing and discharged through the collar 17 about the duct 21 into the fine 11. The odors from the stove as well as the particles of grease carried by the air from the stove are drawn into the casing and forced into the flue. Furthermore, the air in passing through the collar 17 about the duct 21 causes a suction in the duct 21 which draws the gases, smoke or other vapors from the stove through the pipe 1 1 and discharges them into the flue 11 with the same result as if the pipe 14 was directly connected to the flue 11 as in conventional constructions.

It will be apparent that with this device the operation of the stove is in no way impaired but in fact a greater draft may be supplied for the stove which will be beneficial particularly with coal or wood-burning stoves. Furthermore, the device may be located directly above the stove so as to draw the vapors from the stove into the same with the smallest amount of travel through the room in which the stove is located. It will also be apparent that this device may be applied to any stove having a pipe connecting it'with a flue, and that the operation of inserting the device in the line of pipe is readily and easily accomplished by the ordinary householder.

Although this ventilating device may be formed of sheet or other metal, we prefer to form it of a molded material such as bakelite or other moldable sound insulating material so that the noise of the motor will be reduced as much as possible. In such case we prefer to mold the casing 13 separate from the cover 16 and to secure the latter thereto by screws such as 30 or other suitable means so that ready access to the interior of the casing is provided as well as greater ease in the molding operation. In any case the duct 21 may be not only largest at its inlet end, from which it is shown as supported, and there continuous with the protruding collar 20, but molded as an integral part of a wall of the structure, although it will be apparent that any of the mentioned parts might be molded separately and afterwards secured in place.

In the construction shown in Figs. 2 and 3 the casing may be rotated about the axis of the collar 17 in applying the device to a wall so that the pipe 14 may enter it from the bottom, sides or top, as will readily be apparent, thus providing means whereby the device may be inserted in a horizontal or vertical line of pipe as found necessary. Where the stove is positioned a substantial distance away from the wall having the flue, the construction shown in Figs. 2 and 3 may be modified as shown in Fig. 4 so that the pipe 14; may connect with it in a horizontal direction from the front face of the casing. In such a case, the collar 20 and duct 21 are not provided in the casing 13, but instead a front wall 31 is provided having the collar 22 and funnel-shaped portion 23 in the same manner as the wall 16, but further provided with a collar 32 projecting outwardly from the front face thereof for connection tothe pipe 14. The collar 32 is provided with an inwardly extending duct portion 33 of substantially the same form as the duct 21 and exhausting into the collar 17 in the same manner.

\Vhere a greater suction on the duct 21 or 33 leading from the stove is desired than is possible in the constructions shown in Figs. 2, 3 and 4, the collar 17 may be formed as indicated as at 3a in Fig. 5 in which the interior surface thereof is formed to provide a venturi. In any case the duct 21 or 23, as the case may be, preferably terminates at a point within the collar 17, which thus serves as the throat of a venturi, with the result that the lowered pressure at the throat increases the suction in the duct.

If desired, the efliciency of the device may be somewhat increasedby providing a hood such as is indicated at 35 in Figs. 1 and 1. This hood may be made of suflicient size to overlie the top surface of the stove 12 and may be secured to the device as indicated in Fig. 4 by providing the rear edge thereof with flanges 36 which may be secured to the ventilator with the same screws 30 that hold the front face to the body of the casing. lVith this addition the device is as efiicient as any hood provided as an original installation in the building without the necessity of any changes in the construction of the building whatsoever.

In the: drawings the ventilator is shown supported directly against the wall 10, and this is usually preferable. However, it may be desirable to support the same away from vi'ous that suitable. pipes such'as 14 may bev employed to connect the collar 17 to the fiuew' 11 and the results will be identical to those.

herein described.

Although but alimi ed number of 1nodi-' fications of thewpresent are shown in the accompanylng drawing, it will be apparent that-the same issubject to various modifications and changes without departing from the. essential features disclosed, and these may take the form-of various changes in the contour of the casing and arrangements of parts therein, and these and other formal changes may be made in the specific embodiment of the invent-ion described without'de parting from-the spirit or substance of the broad invention, the scope of which is commensurate with the appended claims.

hat we claim is: 5 r

1. In combination with-a wall having a flue opening, anda stove, a casing secured to said wall provided with an opening, a collar bounding said opening received in said flue opening, said casingbeing provided with; a second opening, atpipe connecting said second opening with said stove, a duct eXtending completely through said casingand 111130 said collar and terminatingtherein,'the end of said duct within said collar being substantially smaller than said collar, and disposed favorably to a suction effect therein, and motor driven means independent of said.

openings. for drawing. air into said casing and forcingit out of said casing between said collar and said duct into said flue, to produce said suction effect in that portion of said duct which is disposed within said collar.

2. In combination, a casing provided with an inlet opening and a discharge opening each provided with collars, said collar for said discharge opening being interiorly formed to provide a venturi, a duct connected with said inlet opening terminating in the throat of said'venturi in generally spaced relationship with respect to the walls thereof, and motor driven means for drawing air into said casing independently of said inlet or discharge openings. 7

3. In combination, a casing provided with an outlet, a collar surrounding said outlet adapted for reception in a flue, a duct eX- tending completely through said casing and so terminating at one end, within. said collar and in generally spaced relationship in respect to the walls thereof as there to produce a suction effect, means for connecting the opposite end of said duct to a stove pipe, said casing being provided with an opening therein, a fan in said opening, a motor for driving said fan, and a hood carried by said casing overlying said openin 4. In combination with a venturi formed by a stove pipe and chimney flue, a casing surrounding said venturi, an opening in said casing and motor driven means drawing air into said casing through said opening and forcing it out of said venturi.

5. A casing having three openings in the walls thereof, an uninterrupted duct extending completely through said casing between two of said openings, said duct being sealed to said casing about one of said two openings and only partly obstructing the other of said two openings, a fan cooperating with the third of said openings, and means for driving said fan whereby to draw air into said casing through said third opening and to force it out of said casing through said other of said two openings, thereby producing a suction from said duct, at a point beyond said casing.

6. A Ventilating device for use in combination with a stove pipe and stove flue and in which the stove pipe includes a duct whose outlet end is materially smaller than the stove fiue and extends into thestove flue, said device comprising: a casing sealed to and supporting an inward end of said duct at a point remote from said outlet end, said duct passing uninterruptedly through said casing and said casing being provided with an inlet opening, a fan adjacent the opening, and a motor operating the fan,whereby air is drawn through the opening and forced into the flue about the outlet end of said duct, for a suction efiecttherein.

JOHN J. MULLIN. JAMES L. FOLEY. 

